@import "https://cdn.bootcdn.net/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css";
/* css init */

body, dl, dt, dd, p, ul, ol, li, h1, h2, h3, h4, h5, h6, pre, form, select, fieldset, input, button, textarea, blockquote {
  margin: 0;
  padding: 0;
  list-style: none;
}

/* 公共样式 */

.left {
  float: left;
}

.img {
  width: 100%;
}

.position {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}